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Sclerocephalus arabicus Boiss.

Synonyms

Paronychia sclerocarpa, Paronychia sclerocephala, Sclerocephalus aucheri

Common names

Hasak, thereisa, Knucklehead Weed

LinkSclerocephalus arabicus in desert near industrial zone of Ras Laffan, north from Doha. Qatar, March 23, 2013
Location on mapsRashid Street, Ad-Daẖirah, Qatar
LinkKnucklehead Weed (Sclerocephalus arabicus, Paronychia sclerocephala, local names hasak, thereisa) near a road to Saudi Arabia in southern Qatar, February 11, 2014
Location on mapsQatar-UAE Road, Qatar
LinkKnucklehead Weed (Sclerocephalus arabicus, Paronychia sclerocephala, local names hasak, thereisa) near a road to Sawda Natheel in southern Qatar, February 11, 2014
Location on mapsQatar-UAE Road, Qatar
LinkKnucklehead Weed (Sclerocephalus arabicus, Paronychia sclerocephala, local names hasak, thereisa) in sand near Trainah in southern Qatar, February 14, 2014
Location on mapsخط الوكير، Qatar
LinkKnucklehead Weed (Sclerocephalus arabicus, Paronychia sclerocephala, local names hasak, thereisa) on roadside of Dukhan Highway near Al Shakhaniya. Qatar, January 15, 2016
Location on mapsDukhan Hwy, Qatar
LinkMat of Knucklehead Weed (Sclerocephalus arabicus, Paronychia sclerocephala, local names hasak, thereisa) in roadside depression near Dukhan Highway. Qatar, January 15, 2016
Location on mapsDukhan Hwy, Qatar
LinkSeedlings of Knucklehead Weed (Sclerocephalus arabicus) on roadside near Ras Laffan. Qatar, January 16, 2016
Location on mapsUnnamed Road, Qatar
LinkClose up of a seedling of Knucklehead Weed (Sclerocephalus arabicus) taken from a roadside near Ras Laffan. Qatar, January 16, 2016

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Acknowledgements

QNHG (Qatar Natural History Group) and associated people, for a possibility to participate in their field excursions and to learn about local nature.